The aim of this thesis is to contribute with knowledge on how library staff work to increase cognitive accessibility for people with cognitive disabilities in libraries. According to the Swedish Library Act and The UN Convention on the Rights of Persons with Disabilities (UNCRPD), people with cognitive disabilities are a priority group. The aim is achieved through five semi-structured interviews with library staff that actively work to increase cognitive accessibility for this group. The empirical data from the interviews were categorized into themes and analyzed through a combination of M. K. Buckland ́s fifth barrier in the theory of Access to Information, and Johansson and Larsdotters five categories of information.  Our study shows library staff´s perceptions and descriptions of the work that is done to increase cognitive accessibility in libraries. Two parts that seem to be important are a friendly behavior from the library staff towards people with cognitive disabilities, and the reduction of impressions in the library room, in order to avoid information overload. The staff's commitment, competence and collaboration with the focused user group, appears to be key factors in the development of cognitive accessibility work in libraries.